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A NOVEL APPROACH FOR TARGETING DNA TO DENDRITIC CELLS IN VIVO FOR VACCINE DEVELOPMENT AND CANCER IMMUNOTHERAPY
Funder
National Health and Medical Research Council
Funding Amount
$430,250.00
Summary
The use of genetic material, known as DNA, as a vaccine, has been a relatively new advance in vaccination technology with potential for combating many infectious diseases and cancers. The use of DNA has the advantage that it can be easily manipulated to develop new vaccines that have the desired preventative and-or immunotherapeutic effect. For optimal effect, however, the DNA to be used as a vaccine needs to be targeted to specific cell types in the body. Evidence suggests that a minor populati ....The use of genetic material, known as DNA, as a vaccine, has been a relatively new advance in vaccination technology with potential for combating many infectious diseases and cancers. The use of DNA has the advantage that it can be easily manipulated to develop new vaccines that have the desired preventative and-or immunotherapeutic effect. For optimal effect, however, the DNA to be used as a vaccine needs to be targeted to specific cell types in the body. Evidence suggests that a minor population of cells known as dendritic cells, which are present in blood and other tissues, play an important role in eliciting the effects of DNA vaccines. However, current methods for delivering DNA to these cells often lack selectivity in delivery, and-or use viruses to deliver the DNA. This can pose the risk of allergic type reactions and-or possibly cause tumours. The use of small membranous vesicles known as liposomes, made of phospholipids, has recently attracted considerable interest as DNA delivery vehicles, since these are considered safe, and have the potential to deliver large quantities of DNA. Although DNA can easily be packaged inside liposomes, it is has not been easy to target the liposomes and their contents (eg. encapsulated DNA) to specific cells (such as dendritic cells) within the body. We have recently produced a novel chelator lipid molecule which can be used to conveniently attach onto the liposome surface specific targeting molecules, such as engineered forms of antibody fragments, that can target or steer the liposomes together with their payload (eg. the DNA), directly to dendritic cells. This project will test the potential for using such targeted liposomes as DNA vaccines by examining whether liposomes containing DNA for a model antigen can be used in vaccinations to inhibit the growth and metastasis of a highly metastatic tumour (melanoma) in mice.Read moreRead less
Development Of Improved Vaccine Strategies For Measles Using Plant-derived Edible Vaccines
Funder
National Health and Medical Research Council
Funding Amount
$331,980.00
Summary
Measles is a highly contagious viral disease that is contracted via the respiratory tract. Severe infection may lead to complications such as otitis media, pneumonia, encephalitis. Despite our current vaccination strategy outbreaks still occur in Australia and measles is a major problem in developing countries. In developing nations the case fatality rate of measles is several hundred times that of developed nations. Over 800,000 children still die each year due to measles. Problems with the cur ....Measles is a highly contagious viral disease that is contracted via the respiratory tract. Severe infection may lead to complications such as otitis media, pneumonia, encephalitis. Despite our current vaccination strategy outbreaks still occur in Australia and measles is a major problem in developing countries. In developing nations the case fatality rate of measles is several hundred times that of developed nations. Over 800,000 children still die each year due to measles. Problems with the current vaccination strategy are: a) doesn't work in children less than 1 year of age, b) must be kept cold c) must be given by injection. We believe that a plant derived edible vaccine for measles will address the limitations of currently available vaccine i.e. we can give it children under the age of 1 year, it can be eaten and doesn't have to be kept cold.Read moreRead less
Mechanisms Of Macrophage Activation By Immunostimulatory DNA
Funder
National Health and Medical Research Council
Funding Amount
$230,728.00
Summary
This project is based upon the observation that the mammalian immune system can distinguish between its own genetic material (DNA) and the genes of infectious agents such as bacteria. This fact has implications for understanding how the immune system copes with infection, and also for design of new therapies and vaccines. Our central aim is to define exactly how this recognition system works. The cells that respond most vigorously to foreign DNA are large white blood cells called macrophages. We ....This project is based upon the observation that the mammalian immune system can distinguish between its own genetic material (DNA) and the genes of infectious agents such as bacteria. This fact has implications for understanding how the immune system copes with infection, and also for design of new therapies and vaccines. Our central aim is to define exactly how this recognition system works. The cells that respond most vigorously to foreign DNA are large white blood cells called macrophages. We aim to find the macrophage protein which binds to foreign DNA and triggers the activation of the immune system. The type of immune responses initiated by foreign DNA may be useful in treatment of allergies and cancer and for improving vaccinations.Read moreRead less
Polynucleotide Vaccine Based On Targeted Delivery To Antigen Presenting Cells
Funder
National Health and Medical Research Council
Funding Amount
$540,075.00
Summary
We have previously generated a vaccine for breast and other adenocarcinomas by linking a breast cancer associated protein, MUC-1, to a sugar called mannan. This complex was capable of eradicating tumours in mice and its efficacy has been evaluated in human clinical trials (12 in total). As an extension to these studies we have now found that this sugar, mannan, can be used to deliver DNA to immune cells. The current project will evaluate a DNA vaccine for breast cancer.